As a former deputy state underwater archaeologist, Mark Wilde-Ramsing can’t help but look down. While rowing around North Carolina’s Eagles Island, at the tip of the Gullah Geechee corridor, he noticed signs of human-made structures, visible at low tide. Though he’d retired, he was still active in the field and knew his former agency hadn’t recorded the structures – which meant he had come across something previously undocumented. The next step was figuring out exactly what he’d found. Mark Wilde-Ramsing (left) and Joni ‘Osku’ Backstrom near an area that was home to rice plantations dating to the 1700s, on 25